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|
use nihav_core::frame::*;
use nihav_core::demuxers::*;
struct FLACDemuxer<'a> {
src: &'a mut ByteReader<'a>,
data_start: u64,
tot_samples: u64,
cur_samples: u64,
blk_samples: u16,
min_samples: u16,
min_size: usize,
max_size: usize,
srate: u32,
build_index: bool,
}
impl<'a> FLACDemuxer<'a> {
fn new(io: &'a mut ByteReader<'a>) -> Self {
Self {
src: io,
data_start: 0,
tot_samples: 0,
cur_samples: 0,
blk_samples: 0,
min_samples: 0,
min_size: 0,
max_size: 0,
srate: 0,
build_index: false,
}
}
}
impl<'a> RawDemuxCore<'a> for FLACDemuxer<'a> {
fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> {
let tag = self.src.read_tag()?;
validate!(&tag == b"fLaC");
let mut streaminfo: Vec<u8> = Vec::new();
let mut srate = 0u32;
let mut channels = 0u8;
loop {
let id1 = self.src.read_byte()?;
let len = self.src.read_u24be()? as usize;
let id = id1 & 0x7F;
match id {
0x00 => {
validate!(len >= 34);
streaminfo = vec![0u8; len];
self.src.read_buf(&mut streaminfo)?;
let min_bs = read_u16be(&streaminfo[0..])?;
let max_bs = read_u16be(&streaminfo[2..])?;
if min_bs == max_bs {
self.blk_samples = max_bs;
}
self.min_samples = min_bs;
self.min_size = read_u24be(&streaminfo[4..])? as usize;
self.max_size = read_u24be(&streaminfo[7..])? as usize;
let word = read_u24be(&streaminfo[10..])?;
srate = word >> 4;
channels = (((word >> 1) & 7) + 1) as u8;
self.tot_samples = (u64::from(streaminfo[13] & 0xF) << 32) | u64::from(read_u32be(&streaminfo[14..])?);
},
0x03 => {
validate!((len % 18) == 0);
seek_index.mode = SeekIndexMode::Present;
for _ in 0..len / 18 {
let sample = self.src.read_u64be()?;
let offset = self.src.read_u64be()?;
let _nsamps = self.src.read_u16be()?;
let time = sample * 1000 / u64::from(srate.max(1000));
seek_index.add_entry(0, SeekEntry { time, pts: sample, pos: offset });
}
},
_ => self.src.read_skip(len)?,
};
if (id1 & 0x80) != 0 {
break;
}
}
if seek_index.mode != SeekIndexMode::Present {
seek_index.mode = SeekIndexMode::Automatic;
self.build_index = true;
} else {
self.build_index = false;
}
self.data_start = self.src.tell();
validate!(srate != 0);
self.srate = srate;
let base = if self.blk_samples != 0 { u32::from(self.blk_samples) } else { 1 };
let ahdr = NAAudioInfo::new(srate, channels as u8, SND_S16P_FORMAT, base as usize);
let ainfo = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ahdr), Some(streaminfo));
strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, base, srate, 0)).unwrap();
Ok(())
}
fn get_data(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NARawData> {
let stream = strmgr.get_stream(0).unwrap();
let mut buf = vec![0; 8192];
let size = self.src.read_buf_some(&mut buf)?;
buf.truncate(size);
Ok(NARawData::new(stream, buf))
}
fn seek(&mut self, time: NATimePoint, seek_index: &SeekIndex) -> DemuxerResult<()> {
if seek_index.mode == SeekIndexMode::Present {
let ret = seek_index.find_pos(time);
if ret.is_none() {
return Err(DemuxerError::SeekError);
}
let seek_info = ret.unwrap();
self.cur_samples = seek_info.pts;
self.src.seek(SeekFrom::Start(self.data_start + seek_info.pos))?;
Ok(())
} else {
Err(DemuxerError::NotPossible)
}
}
fn get_duration(&self) -> u64 { self.tot_samples * 1000 / u64::from(self.srate) }
}
impl<'a> NAOptionHandler for FLACDemuxer<'a> {
fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
fn set_options(&mut self, _options: &[NAOption]) { }
fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
}
pub struct FLACDemuxerCreator { }
impl RawDemuxerCreator for FLACDemuxerCreator {
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn RawDemuxCore<'a> + 'a> {
Box::new(FLACDemuxer::new(br))
}
fn get_name(&self) -> &'static str { "flac" }
fn check_format(&self, br: &mut ByteReader) -> bool {
if br.seek(SeekFrom::Start(0)).is_err() {
return false;
}
matches!(br.read_tag(), Ok([b'f', b'L', b'a', b'C']))
}
}
#[cfg(test)]
mod test {
use nihav_core::codecs::*;
use super::*;
use crate::llaudio_register_all_packetisers;
use std::fs::File;
#[test]
fn test_flac_raw_demux() {
// sample: https://samples.mplayerhq.hu/A-codecs/lossless/luckynight.flac
let mut file = File::open("assets/LLaudio/luckynight.flac").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br = ByteReader::new(&mut fr);
let mut dmx = FLACDemuxer::new(&mut br);
let mut sm = StreamManager::new();
let mut si = SeekIndex::new();
dmx.open(&mut sm, &mut si).unwrap();
let stream = sm.get_stream(0).unwrap();
let mut pkt_reg = RegisteredPacketisers::new();
llaudio_register_all_packetisers(&mut pkt_reg);
let creator = pkt_reg.find_packetiser("flac").unwrap();
let mut pkts = (creator)();
let mut tot_size = 0;
while let Ok(pkt) = dmx.get_data(&mut sm) {
tot_size += pkt.get_buffer().len();
pkts.add_data(&pkt.get_buffer());
}
let mut tot_size2 = 0;
let mut npkts = 0;
while let Ok(Some(pkt)) = pkts.get_packet(stream.clone()) {
tot_size2 += pkt.get_buffer().len();
npkts += 1;
}
assert_eq!(npkts, 579);
assert_eq!(tot_size, tot_size2);
}
}
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